Ordovician Period

This is the second period of the Paleozoic Era.

Arthropods and Invertebrates still dominated the oceans, as well as new corals and plants. Fish began to appear in the early part of the period, although some may have appeared in the Late Cambrian.

Many meteors hit the land during this period, but there was no life on land yet though. The continents of Gondwana and Laurentia were still dominant.

By the end of the period, a mass extinction occurred, known as the Ordovician-Silurian extinction event. It wiped 48-51% of all marine life. Conodonts and Trilobites suffered many loses of families, but some still manages to survive. This event may have been due to major glaciation in Gondwana.